tntea
I used to make quite a study of astrology and numerology. It was rather difficult to find a listing of the numerological correspondences for planets and signs that was both complete and universal. It depends on the particular type of numerology or astrology that you subscribe to, and it also depends on whether the information you're using pre-dates the discovery of the outer planets. Even then, it also depends on your philosophy about the various planets and their rightful rulerships. Well, I guess that's just the nature of these disciplines since they are both just as much arts as sciences, and they are both very much open to interpretation. I think you just have to keep an open mind and use whatever values resonate best with you for your particular applications.
The following listing is given by Kristyna Arcarti in her book. I wouldn't consider it to be universally accepted, but these values have worked quite well for me.
Pluto................... 0
Sun..................... 1
Moon................... 2
Jupiter................. 3
Uranus................ 4
Mercury............... 5
Venus................. 6
Neptune............. 7
Saturn................ 8
Mars................... 9
Aries................... 9
Taurus................ 6
Gemini................ 5
Cancer................ 2 and 7
Leo..................... 1 and 4
Virgo................... 5
Libra................... 6
Scorpio............... 9
Sagittarius......... 3
Capricorn........... 8
Aquarius............ 8
Pisces................ 3
I hope this is of some help to you. Some other systems simply use the number of the native house for a sign or planet. Sometimes the numbers corresponding to opposing signs are also related. I would encourage you to search until you find the information that is consistent with your needs and philosophy.
Good luck, aye'